【英文标准名称】:StandardTestMethodsforAbsorbanceofPolyethyleneDuetoMethylGroupsat1378cm
【原文标准名称】:含甲基团的聚乙烯对波长为1378cm-1光波吸收率的试验方法
【标准号】:ASTMD2238-1992(2004)
【标准状态】:现行
【国别】:
【发布日期】:1992
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D20.70
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:试验;甲基;保持能力;甲基化合物;塑料;聚乙烯
【英文主题词】:Fouriertransformspectroscopy;infraredspectroscopy;methylgroups;polyethylene;quantitativeanalysis
【摘要】:Wheninterpretedwiththeaidofappropriatecalibrationdata,eithertestmethodcanbeusedtocomparethetotalmethylcontentsofpolyethylenesmadebysimilarprocesses.Suchinformationcanbeinterpretedintermsofspecificalkylgroupswiththeaidofdataoninfraredabsorptionatcertainotherwavelengths(3).Note48212;Thebiasofdeterminationoftheconcentrationoftotalalkylgroupsdependsonknowingtheconcentrationsofmethylandethylbranchespresent,sincethesebrancheshaveanomalouslyhighabsorptivitiespergroupat1378cmx2212;1(7.25x03BC;m).Knowledgeoftotalmethylgroupsinpolyethylene,whencombinedwithdataonmolecularweightandonreactiveendgroupssuchasvinyl,canleadtoassignmentofend-groupstructuresandcanshedlightuponpolymerizationmechanisms.Dataontotalmethylgroupsinpolyethylenecanbecorrelatedqualitativelywithcertainpolymerpropertiessuchasmeltingpoint,density,stiffness,andothermechanicalpropertiesthatarecloselydependentonthedegreeofcrystallinityofthepolymer.Thesetestmethodsareespeciallysuitableforresearch.Theyhavenotbeentestedforuseinmanufacturingcontrol.1.1Thesetestmethodscovermeasurementbyinfraredabsorptionspectrophotometryofthe1378.4-cm1(7.255-m)bandinpolyethyleneduetomethylgroups.(1,2,4-7)Twotestmethodsarecovered:1.1.1TestMethodAusescompensationwithastandardsamplefilmorwedgeofknownmethylcontent.1.1.2TestMethodBusescompensationwithawedgeofpolymethyleneorapolyethyleneofknownlowmethylcontent.1.2ThesetestmethodsareapplicabletopolyethylenesofTypesI(density910to925kg/m3),II(density926to940),andIII(density941to965).Note18212;Fordeterminationofdensity,seeSpecificationsD1248.Note28212;IncasesofTypeIIIpolyethylenewithdensitiesgreaterthan0.950g/cm3,differentresultsareobtainedwiththetwotestmethods.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninbracketsareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecifichazardsstatementsaregiveninSection7.Note38212;ThereisnosimilarorequivalentISOstandardcoveringthesubjectmatterofthesetestmethods.
【中国标准分类号】:G32
【国际标准分类号】:83_080_20
【页数】:7P.;A4
【正文语种】:


【英文标准名称】:CastMetalJointBoxesforPowerCablesupto10kV;CorrelationofJointBoxeswithPlasticInsulatedCables0.6/1kV
【原文标准名称】:最高可达10kV电力电缆用金属铸造连接盒.第6部分:用0.6/1kV塑料绝缘电缆对连接盒的连接
【标准号】:DIN47600-6-1974
【标准状态】:现行
【国别】:德国
【发布日期】:1974-10
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:连接套管;塑料;电力电缆
【英文主题词】:plastics;powercables;connectingsleeves
【摘要】:Jointboxesforpowercablesupto10kV;coordinationofjointboxeswiththeplasticinsulatedcables0,6/1kV
【中国标准分类号】:K13
【国际标准分类号】:29_120_20
【页数】:2P;A4
【正文语种】:德语